Use libmariadbclient from Rtools if found

.github/workflows/R-CMD-check.yaml

@@ -22,7 +22,8 @@ jobs:
           - {os: macos-14,        r: 'release'}
           - {os: windows-latest,  r: '4.1'}
           - {os: windows-latest,  r: '4.2'}
-          - {os: windows-latest,  r: 'release'}
+          - {os: windows-latest,  r: '4.3'}
+          - {os: windows-latest,  r: '4.4'}
           - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest,   r: 'release'}
           - {os: ubuntu-latest,   r: 'oldrel-1'}

RMySQL.Rproj

@@ -1,4 +1,5 @@
 Version: 1.0
+ProjectId: df551388-4dd3-412f-ac41-f4c0a0c8a880
 
 RestoreWorkspace: Default
 SaveWorkspace: Default

src/Makevars.win

@@ -1,19 +1,23 @@
-RWINLIB = ../windows/libmariadbclient
+PKG_CONFIG_NAME = libmariadbclient
+PKG_CONFIG ?= $(BINPREF)pkg-config
+PKG_LIBS := $(shell $(PKG_CONFIG) --libs $(PKG_CONFIG_NAME))
 
-ifeq ($(R_COMPILED_BY),gcc 8.3.0)
-TLS_LIBS = -lssl -lcrypto 
+ifneq ($(PKG_LIBS),)
+$(info using $(PKG_CONFIG_NAME) from Rtools)
+PKG_CPPFLAGS := $(shell $(PKG_CONFIG) --cflags $(PKG_CONFIG_NAME)) $(EXTRA_CFLAGS)
+else
+RWINLIB = ../windows/libmariadbclient
+PKG_CPPFLAGS = -I$(RWINLIB)/include/mariadb
+PKG_LIBS = -L$(RWINLIB)/lib$(R_ARCH) -L$(RWINLIB)/lib \
+	-lmariadbclient -lssl -lcrypto -lz -lbcrypt -lsecur32 -lshlwapi -lcrypt32 -lgdi32 -lws2_32 -pthread
 endif
 
-PKG_CPPFLAGS = -I$(RWINLIB)/include/mariadb
-PKG_LIBS = \
-	-L$(RWINLIB)/lib$(R_ARCH) \
-	-L$(RWINLIB)/lib \
-	-lmariadbclient $(TLS_LIBS) -lz -lbcrypt -lsecur32 -lshlwapi -lcrypt32 -lgdi32 -lws2_32 -pthread
+all: $(SHLIB)
+
+$(OBJECTS): $(RWINLIB)
 
-all: clean winlibs
+$(RWINLIB):
+	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/winlibs.R"
 
 clean:
 	rm -f $(SHLIB) $(OBJECTS)
-
-winlibs:
-	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/winlibs.R" $(VERSION)